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I have an iMac 17" 5.1 with newly upgraded OX 10.6.5 which shows the spinning beach ball more than it should in my opinion. I once had a similar situation with an older Mac which turned out to be a bad hard disk. Once replaced it ran fine. How can I tell if my hard drive in my iMac is faulty? I have 4 gigs of memory.

Boot the iMac with your Snow Leopard disk and run Disk Utility from the top menu: Utilities, Disk Utility. Highlight your hard drive on the left (top entry) and then select the First Aid tab on the right. Run a Verify and Repair. If you wish, you can also do a repair permissions which will take awhile to complete.

If the hard drive checks out OK, download and run the free OnyX maintenance utility. Be sure to read directions first.